A woman crosses Dalton Street in Boston, passing a new billboard designed by the father of a Parklan

Charles Krupa / AP

A woman crosses Dalton Street in Boston, passing a new billboard designed by the father of a Parkland, Florida school shooting victim, Thursday, Nov. 1, 2018. Manuel Oliver designed the 90-foot long billboard in memory of his son Joaquin Oliver, one of 17 people killed when former student Nikolas Cruz allegedly opened fired in February at Marjory Stoneman Douglas High School. The billboard calls for stricter gun laws. (AP Photo/Charles Krupa)

A woman crosses Dalton Street in Boston, passing a new billboard designed by the father of a Parkland, Florida school shooting victim, Thursday, Nov. 1, 2018. Manuel Oliver designed the 90-foot long billboard in memory of his son Joaquin Oliver, one of 17 people killed when former student Nikolas Cruz allegedly opened fired in February at Marjory Stoneman Douglas High School. The billboard calls for stricter gun laws. (AP Photo/Charles Krupa)